Prepare the Dough:

1. Cream Butter and Sugars: In a large mixing bowl, beat the butter, granulated sugar, and brown sugar until light and fluffy, about 2-3 minutes.
2. Add Wet Ingredients: Mix in the egg and vanilla extract until well combined.
3. Mix Dry Ingredients: In a separate bowl, whisk together the flour, baking soda, salt, cinnamon, and nutmeg.
4. Combine Wet and Dry Ingredients: Gradually add the dry ingredients to the wet mixture, mixing until just combined.
5. Fold in Fruits: Gently fold in the dried cranberries and chopped dried plums.

Chill the Dough:

6. Chill: Cover the dough with plastic wrap and refrigerate for at least 30 minutes. This helps the dough firm up and prevents the cookies from spreading too much during baking.

Shape and Roll:

7. Preheat the Oven: Preheat your oven to 350°F (175°C) and line baking sheets with parchment paper.
8. Form Cookies: Scoop tablespoon-sized portions of dough, roll them into balls, and roll each ball in sparkling sugar to coat.
9. Arrange on Baking Sheets: Place the cookie balls on the prepared baking sheets, spacing them about 2 inches apart.

Bake and Cool:

10. Bake: Bake the cookies for 10-12 minutes or until the edges are set and lightly golden.
11. Cool: Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.